9,409 research outputs found
On iterated powers of positive definite functions
We prove that if is an adapted positive definite function in the
Fourier--Stieltjes algebra of a locally compact group with
, then the iterated powers converge to zero in
the weak* topology . Moreover, if is irreducible,
we prove that as a sequence of u.c.p. maps on the group
-algebra converges to zero in the strong operator topology
The three-nucleon system as a laboratory for nuclear physics: the need for 3N forces
Recent experimental results in three-body systems have unambiguously shown
that calculations based on nucleon-nucleon forces fail to accurately describe
many experimental observables and one needs to include effects which are beyond
the realm of the two-body potentials. This conclusion owes its significance to
the fact that experiments and calculations can both be performed with a high
accuracy. In this short review, a sample of recent experimental results along
with the results of the state-of-the-art calculations will be presented and
discussed.Comment: Commissioned article for Nuclear Physics News, 8 pages, 6 figure
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